Android对话框和帧动画

Android对话框

在一个例子中展示四种对话框。

设置四个按钮

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <Button
        android:id="@+id/bt_dialog1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="普通对话框" />

    <Button
        android:id="@+id/bt_dialog2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="单选对话框" />

    <Button
        android:id="@+id/bt_dialog3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="多选对话框" />

    <Button
        android:id="@+id/bt_dialog4"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="进度条对话框" />

</LinearLayout>

分别是普通对话框、单选对话框、多选对话框、进度条对话框

package com.example.stylethemetest;

import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.os.SystemClock;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private Context mContext;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mContext = this;

        Button btDialog1 = (Button) findViewById(R.id.bt_dialog1);
        Button btDialog2 = (Button) findViewById(R.id.bt_dialog2);
        Button btDialog3 = (Button) findViewById(R.id.bt_dialog3);
        Button btDialog4 = (Button) findViewById(R.id.bt_dialog4);

        btDialog1.setOnClickListener(this);
        btDialog2.setOnClickListener(this);
        btDialog3.setOnClickListener(this);
        btDialog4.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            // 1. 普通对话框
            case R.id.bt_dialog1:
                AlertDialog.Builder alertDialog1 = new AlertDialog.Builder(mContext);

                alertDialog1.setTitle("注意");
                alertDialog1.setMessage("真的要删除吗？");
                alertDialog1.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(mContext, "你点击了确定", Toast.LENGTH_SHORT).show();
                    }
                });
                alertDialog1.setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(mContext, "你点击了取消", Toast.LENGTH_SHORT).show();
                    }
                });
                alertDialog1.show();
                break;
            // 2. 单选对话框
            case R.id.bt_dialog2:
                final AlertDialog.Builder alertDialog2 = new AlertDialog.Builder(mContext);

                alertDialog2.setTitle("选择学历");
                final String[] edu = {"小学", "初中", "高中", "本科", "研究生", "博士", "其他"};
                // 选择默认选中，-1表示不选中
                alertDialog2.setSingleChoiceItems(edu, -1, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        String eduLevel = edu[which];
                        Toast.makeText(mContext, eduLevel+which, Toast.LENGTH_SHORT).show();
                    }
                });
                alertDialog2.setPositiveButton("选择", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // TODO:处理确定逻辑
                    }
                });
                alertDialog2.show();
                break;
            // 3. 多选对话框
            case R.id.bt_dialog3:
                AlertDialog.Builder alertDialog3 = new AlertDialog.Builder(mContext);
                alertDialog3.setTitle("选择你喜欢吃的水果");
                final String[] items = {"榴莲", "苹果", "葡萄", "香蕉", "黄瓜", "火龙果", "荔枝"};
                // bool值和上面的条目对应，true表示默认选中
                final boolean[] checkedItems = {false, true, false, true, false,
                        false, false};
                alertDialog3.setMultiChoiceItems(items, checkedItems, new DialogInterface.OnMultiChoiceClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which, boolean isChecked) {
                        // 下标和是否被选中
                        Toast.makeText(mContext, which+ " " +isChecked, Toast.LENGTH_SHORT).show();
                    }
                });
                alertDialog3.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        StringBuilder fruits = new StringBuilder();
                        for (int i = 0; i < items.length; i++) {
                            if (checkedItems[i]) {
                                // 就证明是选中的
                                String fruit = items[i];
                                fruits.append(fruit).append(" ");
                            }
                        }
                        Toast.makeText(mContext, fruits, Toast.LENGTH_SHORT).show();
                    }
                });
                // show里面调用了create
                alertDialog3.show();
                break;
            // 4. 进度条对话框
            case R.id.bt_dialog4:
                final ProgressDialog progressDialog = new ProgressDialog(mContext);
                // 默认STYLE_SPINNER，小圆圈选装。可选水平进度条
                progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
                progressDialog.setTitle("加载");
                progressDialog.setMessage("Loading...");
                // false表示用户可不能通过按下back键或者对话框外的地方退出，默认是true。
                progressDialog.setCancelable(true);
                progressDialog.show();
                // 进入条相关组件可以在子线程更新UI
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        for (int i = 0; i < 101; i++) {
                        // 与Thread.sleep不同的是,他不会抛出interruptedException;
                            SystemClock.sleep(50);
                            progressDialog.setProgress(i);
                        }
                        // cancel也调用了dismiss，不过还可可响应setOnCancelListener
                        // hide只是隐藏，没有dismiss掉
                        progressDialog.dismiss();
                    }
                }).start();

                break;
        }
    }
}
 

上图是普通对话框

上图是单选对话框

上图是多选对话框

上图是进度条对话框

Android帧动画初步认识

其实就是加载一系列的图片资源

1. 首先放入一系列图片放入res/drawable中，我放入了drawable-xxhdpi。
2. 在上述文件夹下新建一个xml，如下。 android:oneshot="false"表示循环一次后还接着循环。true的话就是循环一次停止在最后一帧。

<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
    android:oneshot="false" >
    <item android:drawable="@drawable/a" android:duration="500" />
    <item android:drawable="@drawable/b" android:duration="500" />
    <item android:drawable="@drawable/c" android:duration="500" />
    <item android:drawable="@drawable/d" android:duration="500" />
    <item android:drawable="@drawable/e" android:duration="500" />
</animation-list>

主界面就放一个ImageView

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.animationtest.MainActivity">

    <ImageView
        android:id="@+id/iv_animation"
        android:layout_width="100dp"
        android:layout_height="100dp" />

</LinearLayout>
 

MainActivity

package com.example.animationtest;

import android.graphics.drawable.AnimationDrawable;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {

    private ImageView rocketImage;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        rocketImage = (ImageView) findViewById(R.id.iv_animation);
        // [1]找到ImageView控件 用来显示动画效果
        rocketImage = (ImageView) findViewById(R.id.iv_animation);
        // [2]设置背景资源, 传入的是xml
        rocketImage.setBackgroundResource(R.drawable.my_animation);
        // [3]获取AnimationDrawable 类型
        AnimationDrawable ad = (AnimationDrawable) rocketImage.getBackground();
        // [4]开始执行动画
        ad.start();
    }
}
 

结果如下图片所示，其实是动态的。截图成静态了。

---

by @sunhaiyu

2017.5.18